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Table 2
Model for IRC+10216.
| Parameter | Value |
|
|
|
| Distance | d = 130 pc |
| Expansion velocity | vexp = 14.5 km s-1 |
| Mass loss rate (total hydrogen) | Ṁ = 3.25 × 10-5M⊙ yr-1 |
| Stellar radius | R⋆ = 3.9 × 1013 cm |
| Effective temperature | Teff = 2300 K |
| Luminosity (average) | Lavg = 8500 L⊙ |
| Luminosity at maximum | Lmax = 11 850 L⊙ |
| Inner shell radius | 1.2 × 1014 cm (~3 R⋆) |
| Best-fit parameters: | |
| Formation radius Rf | 1.0 × 1014 cm (~2.5 R⋆) |
| Photodissociation radius Rph | >2−3 × 1016 cm |
| f(ortho-NH3) |
|
| f(para-NH3) |
|
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